| 1897-03 |
Sumitomo Copper Rolling Works, which formed the basis of Sumitomo Electric Wire and Cable Works, the predecessor to Sumitomo Electric Industries, Ltd., was established in 1897. |
| 1911 |
Sumitomo Electric Wire and Cable Works established |
| 1911 |
Despite the remarkable development of the electric power business, the nation was still relied on imports for high-grade goods, and its technologies were immature. Lamenting the situation, Kankichi Yukawa, Director and Manager of Sumitomo Head Office, decided to further accelerate the electrical wire business to benefit both Sumitomo and the nation. In the fall of that year, Sumitomo Electric succeeded in the practical application of lead-coated power cables for the first time in Japan, demonstrating a further leap in technology. These cables were used for power transmission from Kyoto Dento's thermal power plant in Fushimi to Kyoto City. |
| 1914 |
Developed trolley wire |
| 1916 |
First delivery was made to Tokyo City (present-day Tokyo metropolis) in 1916. |
| 1928 |
影久商店が大阪市西区にて創業 |
| 1936 |
株式会社影久商店に改組 |
| 1940 |
影久産業（株）と改称 |
| 1945 |
Although the war had ended, plants had been hit hard by air strikes and were in a desperate situation. After expressing appreciation to the employees for all their past efforts, then-President Sadao Bekku said that Japan must now rebuild itself as a cultural nation, and that Sumitomo Electric's products are essential to achieving this, and therefore, the company must strive to manufacture products for achieving its mission in whatever form the company would take. In addition to electric wires, Sumitomo Electric also manufactured daily necessities, and other agricultural tools, using materials on hand. |
| 1948 |
影久電線（株）と改称 |
| 1948 |
富田商店が大阪市東住之江区にて創業 |
| 1950 |
Typhoon Jane was a large typhoon that hit Osaka in September 1950, inflicting damage with 336 people dead, 500,000 victims, and 15,000 houses collapsing mainly in the Kansai region. The western plant of Osaka Works was flooded by water. Aluminum overhead transmission cables bound for India were submerged by floodwaters. Although the products could have been made usable by washing them, management decided to re-make them all, with no thought of gain. This clearly shows our traditional spirit of devoting ourselves wholeheartedly to supplying quality products and placing prime importance on reliability. |
| 1954 |
Succeeded in achieving domestic production of oil-tempered wire |
| 1954 |
株式会社富田商店に改組 |
| 1955 |
Since the start of research in 1955, we have developed air springs mainly for railway cars. |
| 1956 |
東京営業所（現東京本社）を開設 |
| 1961 |
Sumitomo Electric's Dywidag sleepers were adopted for use in the Tokaido Shinkansen in 1961, with full-fledged delivery starting in the following year. |
| 1962 |
Dywidag railway sleepers and air suspension for railway ties |
| 1962 |
In 1962, we developed a diaphragm air spring in cooperation with Sumitomo Metal Industries, Ltd. and supplied to private rail cars and bullet train cars. |
| 1962 |
群馬営業所（現北関東営業所）を開設 |
| 1964 |
Sumitomo Electric's parabolic antennas for syncom satellites were used at the 1964 Tokyo Olympic Games, enabling the world's first satellite TV broadcasting of the Olympics. |
| 1969 |
影久電工（株）と改称 |
| 1970 |
Started production of compound semiconductors. |
| 1970 |
Established first overseas factory in Thailand. |
| 1970 |
EXPO' 70 Provide power cables, steel cords for moving walkways and traffic game. |
| 1971 |
富田通商（株）と改称 |
| 1972 |
住電商事（株）と改称 |
| 1972 |
名古屋営業所（現名古屋支店）を開設 |
| 1974 |
Completed the Tokyo Traffic Control Center, one of world's largest. |
| 1974 |
Started production of optical fiber cables. |
| 1974 |
滋賀出張所（現京滋営業所）を開設 |
| 1978 |
九州営業所（現九州支店）を開設 |
| 1982 |
広島営業所（現中四国支店）を開設 |
| 1984 |
三原工場を開設 |
| 1989 |
東北営業所（現東北支店）を開設 |
| 1992 |
シンガポールにTOMITA INTERNATIONAL TRADING PTE.LTD.（現SUMIDEN INTERNATIONAL TRADIG(SINGAPORE)PTE.LTD.）を設立 |
| 1994 |
香港にTOMIS(H.K)COMPANY LIMITEDを設立 |
| 1995 |
バンコク（タイ）にSumiden Shoji (Thailand) Company Limited（現SUMIDEN INTERNATIONAL TRADING (THAILAND) CO.,LTD.）を設立、香港にSUMIDENSHOJI(H.K)COMPANY LIMITEDを設立 |
| 1996 |
マレーシアにTOMITSU(M)SDN.BHD.（現SUMIDEN INTERNTIONAL TRADING(MALAYSIA)SDN.BHD.）を設立 |
| 2002 |
ISO14001認証取得（ISO9001は2004年認証取得） |
| 2002 |
池田支店（現池田支社）を開設、上海に住電貿易（上海）有限公司、登彌達（上海）貿易有限公司を設立 |
| 2003 |
ハノイ（ベトナム）にSD Vietnam Industries Limitedを設立、香港に住電貿易（香港）有限公司を設立 |
| 2004 |
本社を大阪市西区立売堀に移転 |
| 2005 |
TOMIS(H.K)COMPANY LIMITEDと住電貿易(香港）有限公司が合併し、住電国際貿易（香港）有限公司となる |
| 2006 |
住電貿易（上海）有限公司、登彌達（上海）貿易有限公司が合併し、住電国際貿易（上海）有限公司となる |
| 2008 |
サンディエゴ（米国）に駐在員事務所を開設、ハノイ（ベトナム）に駐在員事務所を開設、沖縄営業所の開設 |
| 2009 |
深圳に住電国際貿易（深圳）有限公司を設立 |
| 2013 |
ハノイ（ベトナム）にSUMIDEN INTERNATIONAL TRADING (VIETNAM) CO.,LTD.を設立 |
